For example, fractional distillation is used in oil refineries to separate crude oil into useful substances (or fractions) having different hydrocarbons of different boiling points. The crude oil fractions with higher boiling points:1  have more carbon atoms.or example, fractional distillation is used in oil refineries to separate crude oil into useful substances (or fractions) having different hydrocarbons of different boiling points. The crude oil fractions with higher boiling points: 1  have more carbon atoms.
Placenta accreta is a serious pregnancy complication that can occur when the placenta attaches itself too deeply into the uterine wall. Placenta accreta is a serious pregnancy complication that can occur when the placenta attaches itself too deeply into the uterine wall. This causes part or all of the placenta to stay firmly attached to the uterus during childbirth. Placenta accreta can result in severe bleeding after delivery. According to the American Congress of Obstetricians and Gynecologists (ACOG), 1 in 533 American women experience placenta accreta each year. In some cases of placenta accreta, a womanâs placenta will attach so deeply into the uterine wall that it attaches to uterine muscle. This is called placenta increta. It can even go more deeply through the uterine wall and into another organ, such as the bladder.
The lowest segment of the uterus is a narrowed portion called the cervix. This cervix has an opening (the os) that leads into the vagina, or birth canal. The placenta is the organ that attaches to the wall of the uterus during pregnancy.The placenta allows nutrients and oxygen from the mother's blood circulation to pass into the developing baby (the fetus) via the umbilical cord.his sequence is necessary because the baby relies on the placenta to provide oxygen until he or she begins to breathe independently. Placental abruption occurs when the placenta separates from the uterus before the birth of the baby.